From patchwork Thu Nov 28 02:42:33 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bibby Hsieh X-Patchwork-Id: 11265345 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D32E615AB for ; Thu, 28 Nov 2019 02:45:15 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A708B20637 for ; Thu, 28 Nov 2019 02:45:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="AZfdOltX"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="iGsRTk0h" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A708B20637 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=mediatek.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=4H8ae9EwN1ZY8iIWRBz/ucaXNa37CCuW3R5P9pWvSBs=; b=AZfdOltXoqY5P3 HOPYhz0zrC5YujPVKCeNI0nSEl6AAWecG0yAH36TRPMU1/YEszjW6ThPfKVPcjA2+XfrufefYQWRv da1pN1gzJoaiCLSr8CRKXvsIhi9I8jPKLCfFyRRc5yAoxxQuVGTnk9//k7GfCMCwGzpNsYa53jxg9 FUM9dH+GbNgnHUi5i1KVdxS//sJ2p8hTZYxumcZey3E+0+NEAnjVgFkwF0cM3k7XiiMafKE86bcBT +YnGdBm733qMKz3X1br7te/RA0PQOI6s2Agr5Io1pAuApf0NZFSnD90ud2PLO2rN7hLIW+jFJ3M/o 9z5tNR5bRnTmxerCG6Kw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ia9nt-0001dM-Le; Thu, 28 Nov 2019 02:45:13 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1ia9nh-0001TK-OZ; Thu, 28 Nov 2019 02:45:03 +0000 X-UUID: d40fc0f01d1e4c99aecb1a8bb686bba4-20191127 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=0vCTXwJv2GLquxlzgk2gQwFIoM5oJce1MlX2/bKkJNM=; b=iGsRTk0hlXIKkYRJHKjnT3BEismMYbiqiECs+a4wrWvhd6JsMftn4hdzeZirt/aTDnnffNgkza/cWiNLGPeyy7rxcsXosCYW0tMwn7q6cNJ17BGUs/86giuAEB8LfTJq/mjFXbomI9+II2zeubL7/eaQpGXjqkW7GsaMAQU9/CY=; X-UUID: d40fc0f01d1e4c99aecb1a8bb686bba4-20191127 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLS) with ESMTP id 1456694699; Wed, 27 Nov 2019 18:45:00 -0800 Received: from mtkmbs08n2.mediatek.inc (172.21.101.56) by MTKMBS62N2.mediatek.inc (172.29.193.42) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 27 Nov 2019 18:43:15 -0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs08n2.mediatek.inc (172.21.101.56) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Thu, 28 Nov 2019 10:42:13 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Thu, 28 Nov 2019 10:42:46 +0800 From: Bibby Hsieh To: David Airlie , Matthias Brugger , Daniel Vetter , , Subject: [PATCH v1 1/6] drm/mediatek: put "event" in critical section Date: Thu, 28 Nov 2019 10:42:33 +0800 Message-ID: <20191128024238.9399-2-bibby.hsieh@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20191128024238.9399-1-bibby.hsieh@mediatek.com> References: <20191128024238.9399-1-bibby.hsieh@mediatek.com> MIME-Version: 1.0 X-TM-SNTS-SMTP: C415EC28D10D4D98CA7C3A32C93B685D07027E2639E1945941113FD2332F427D2000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191127_184501_808710_A82B8B0B X-CRM114-Status: UNSURE ( 8.85 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.0 MIME_BASE64_TEXT RAW: Message text disguised using base64 encoding -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: drinkcat@chromium.org, Bibby Hsieh , srv_heupstream@mediatek.com, linux-kernel@vger.kernel.org, tfiga@chromium.org, CK Hu , Thierry Reding , Philipp Zabel , linux-arm-kernel@lists.infradead.org Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org The state->base.event variable would be access by thread context in mtk_drm_crtc_atomic_begin() or by interrupt context in mtk_drm_crtc_finish_page_flip(), so each part should be a critical section. Fix it. Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.") Signed-off-by: Bibby Hsieh --- drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c index 29d0582e90e9..71f4089a8117 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c @@ -483,12 +483,15 @@ static void mtk_drm_crtc_atomic_begin(struct drm_crtc *crtc, if (mtk_crtc->event && state->base.event) DRM_ERROR("new event while there is still a pending event\n"); + spin_lock_irq(&crtc->dev->event_lock); if (state->base.event) { state->base.event->pipe = drm_crtc_index(crtc); WARN_ON(drm_crtc_vblank_get(crtc) != 0); + WARN_ON(mtk_crtc->event); mtk_crtc->event = state->base.event; state->base.event = NULL; } + spin_unlock_irq(&crtc->dev->event_lock); } static void mtk_drm_crtc_atomic_flush(struct drm_crtc *crtc,